Cisco Secure Client Vulnerability Allows CRLF Injection Attacks
CVE-2024-20337

8.2HIGH

Key Information:

Vendor
Cisco
Status
Cisco Secure Client
Vendor
CVE Published:
6 March 2024

Badges

📈 Trended📈 Score: 3,790👾 Exploit Exists📰 News Worthy

What is CVE-2024-20337?

CVE-2024-20337 is a vulnerability found in Cisco Secure Client, a security product designed to facilitate secure remote access through VPN services. This specific vulnerability pertains to the SAML (Security Assertion Markup Language) authentication process. Due to inadequate validation of user input, an unauthenticated remote attacker could insert carriage return line feed (CRLF) characters into a crafted link. If a user establishes a VPN session by clicking this link, it could lead to the execution of arbitrary script code in their browser, potentially compromising sensitive information, including SAML tokens. This could enable the attacker to gain unauthorized access to resources granted to the victim, posing significant risks to organizations' security.

Technical Details

The vulnerability in CVE-2024-20337 arises from insufficient input validation in the SAML authentication flow of Cisco Secure Client. The issue can be exploited when an attacker convinces a user to click on a manipulative link during the creation of a VPN session. This action can lead to CRLF injection, allowing the attacker to execute malicious scripts within the victim's browser. Such exploitation relies on the user's interaction, making social engineering a critical vector for this vulnerability.

Impact of the Vulnerability

  1. Unauthorized Access to Sensitive Information: By exploiting CVE-2024-20337, attackers can potentially access critical browser-based information, including valid SAML tokens, which can then be leveraged to gain unauthorized remote access to corporate resources.

  2. Execution of Malicious Scripts: The ability to execute arbitrary script code in the victim's browser can lead to various malicious outcomes, including data leakage or further attacks on the local network, thus undermining overall organizational security.

  3. Increased Risk of Compromise: The exploitation of this vulnerability could pave the way for attackers to establish a remote sessions with user privileges, opening the door for further intrusions and increasing the overall risk of a data breach within the organization.

Affected Version(s)

Cisco Secure Client 4.9.00086

Cisco Secure Client 4.9.01095

Cisco Secure Client 4.9.02028

News Articles

favicon imageBritec Computer Systems

Cyber Threat Landscape: A Look at Cisco’s CVE-2024-20337 Patch

Unveil the threat of CVE-2024-20337 with Cisco’s Secure Client flaw. Learn how to secure your VPN sessions and protect against potential hijacking.

11 months ago

favicon imageSpiceworks

Cisco Patches VPN Hijacking Bug - Spiceworks

Cisco has released patches for a critical vulnerability that enabled VPN hijacking in its Secure Client software. Find out more.

11 months ago

favicon imageThe Final Hop

Understanding CVE-2024-20337: A Deep Dive into Cisco's Latest Patch

The Critical Flaw in Cisco's Secure Client Cisco has taken significant steps to mitigate a high-severity vulnerability in its Secure Client software, identified as CVE-2024-20337. With a CVSS score of 8.2, this flaw allowed for a carriage return line feed (CRLF) injection attack, representing a sop...

11 months ago

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 📈

    Vulnerability started trending

  • 👾

    Exploit known to exist

  • 📰

    First article discovered by Help Net Security

  • Vulnerability published

  • Vulnerability Reserved

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